【每日一练】39—七夕节背景轮播图效果的实现

每日一练1年前 (2023)发布 admin

2,137 0 1

今天是七夕节，在这里，我先祝大家七夕节快乐，有情人终成眷属。我们节也要过，学习也要继续，因此，今天我们来实现一个漂亮的七夕幻灯轮播图效果，这个效果我个人觉得非常实用，如果你把这些背景图片换成你心意对象的照片，也依然可以。

这些图片素材，都是我在网上下载的，所以，图片素材就不额外提供了，你直接把素材换成你自己的图片素材就可以了。

下面，我们就一起来看一下今天练习的最终效果：

HTML:

<!DOCTYPE html>
<html>
<head>
<meta charset=”UTF-8″ />
<meta name=”viewport” content=”width=device-width, initial-scale=1.0″ />
<!–字体图标文件–>
<link rel=”stylesheet” href=”https://cdn.staticfile.org/font-awesome/4.7.0/css/font-awesome.css”>
<title>【每日一练】39—背景轮播图效果的实现</title>
</head>
<body>
<div class=”slider-container”>
<div class=”slide active” style=”background-image: url(‘images/01.jpg’);”></div>
<div class=”slide” style=”background-image: url(‘images/02.jpg’);”></div>
<div class=”slide” style=”background-image: url(‘images/03.jpg’);”></div>
<div class=”slide” style=”background-image: url(‘images/04.jpg’);”></div>
<div class=”slide” style=”background-image: url(‘images/05.jpg’);”></div>
<button class=”arrow left-arrow” id=”left”>
<!–字体图标代码–>
<i class=”fa fa-arrow-left”></i>
</button>
<button class=”arrow right-arrow” id=”right”>
<!–字体图标代码–>
<i class=”fa fa-arrow-right”></i>
</button>
</div>
</body>
</html>

CSS:

* {
box-sizing: border-box;
}

body {
font-family: ‘Roboto’, sans-serif;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
height: 100vh;
overflow: hidden;
margin: 0;
background-position: center center;
background-size: cover;
transition: 0.4s;
}

body::before {
content: ”;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100vh;
background-color: rgba(0, 0, 0, 0.7);
z-index: -1;
}

.slider-container {
box-shadow: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23);
height: 70vh;
width: 70vw;
position: relative;
overflow: hidden;
}

.slide {
opacity: 0;
height: 100vh;
width: 100vw;
background-position: center center;
background-size: cover;
position: absolute;
top: -15vh;
left: -15vw;
transition: 0.4s ease;
z-index: 1;
}

.slide.active {
opacity: 1;
}

.arrow {
position: fixed;
background-color: transparent;
color: #fff;
padding: 20px;
font-size: 30px;
border: 2px solid orange;
top: 50%;
transform: translateY(-50%);
cursor: pointer;
}

.arrow:focus {
outline: 0;
}

.left-arrow {
left: calc(15vw – 65px);
}

.right-arrow {
right: calc(15vw – 65px);
}

JS：

const body = document.body
const slides = document.querySelectorAll(‘.slide’)
const leftBtn = document.getElementById(‘left’)
const rightBtn = document.getElementById(‘right’)
let activeSlide = 0
rightBtn.addEventListener(‘click’, () => {
activeSlide++
if (activeSlide > slides.length – 1) {
activeSlide = 0
}
setBgToBody()
setActiveSlide()
})
leftBtn.addEventListener(‘click’, () => {
activeSlide–
if (activeSlide < 0) {
activeSlide = slides.length – 1
}
setBgToBody()
setActiveSlide()
})
setBgToBody()
function setBgToBody() {
body.style.backgroundImage = slides[activeSlide].style.backgroundImage
}
function setActiveSlide() {
slides.forEach((slide) => slide.classList.remove(‘active’))
slides[activeSlide].classList.add(‘active’)
}